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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2fb8cf7c31f252ad2aa830758ef413e26d96c74c15e40ab4cc058610a1866a' 
  AND token = 'cX+7DwHIOVcYAz9ZzAQy2v0eUMZn+/cWcoCUv6L00gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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