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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb39b6af74b9169a56cb558dcfd767b85f9bd6cfdd77210a5704d9dd50bff8e' 
  AND token = 'trQonb08IyGHwiu8Z7Ba69X0TNwkNQUalCuXnC8fHbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00164

JSON explain

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