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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62699757213bdb757c05ca940780ed748b013da1176d1f333aa2d7f67649e3f' 
  AND token = 'SqnvUqEKu3Wzhjds445g5A1DxWJBRSlNf1BVBb1tD7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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