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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1d4d6969595ba70636d7063cad311d27ecc92e01387d86e29ec4aaed8d9ed8' 
  AND token = 'Gg0fNmSvlNegY06vSpmW3MS6CiQ/2G8AjUlvj+k5MPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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