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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f571d883f4d576e4f1fddbba4915f09260cbb87c2f588929fa09a3e93338aa' 
  AND token = 'u4jz7eOo3Tssq3VsIddfK8ijYFXkvJ368fhCDs/MPIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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