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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f6779c467f27cb496d9fbc19db62c9a9b81596cb334fe48acb5507b440539b' 
  AND token = '+WqOPqDsseuyC3USezIncHnjm//PSrAsn9VTrJ4f5GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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