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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7731630c02d60facab74d70cf998e33104dcd282343e0d3aeb10e807d5d5d4c0' 
  AND token = 'Z3vDV70qL91z/llYgt9LwNDsDN0ygDvlGru6pF/NWMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}