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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5418ffe6c860fdcd472528d1c6cbdc04fc10cb7ee8b08ee6f9c7790e72e94c' 
  AND token = '7HP+nurNatRNGZCMYUEa0NwHPdwKHL2nghg8Vrn5HJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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