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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36d2a167e3719ec32b06bdc998a6720cca3ae328715058aea8d529ff6bba201' 
  AND token = 'QtZSZrrcSgNDElRJQO/DCxERnojgcBYEKHq7ZT3G6GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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