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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5748f9c0b165920673c5cab4500174c1855802d1ca8aed965503162cd55f08' 
  AND token = 'HpwjgEbaPDBt6oLoOqd41S3hnB5z1B1iWRMTThplG0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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