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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64aceba7e3de894108219b2b7f3f3c6c7649deb29319319c5a7b1b77e770e3f' 
  AND token = 'of9jat+icK9UB9hEFj0STJDrm2xGcm6bmmrCazEnP3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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