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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936888d9b7adb82ed04966d99e3de74f7f3f5eae26928895031ac4e669e1c9c9' 
  AND token = 'hzhYUJAigQ1/P17iGZ4MZ85ZYCCfY3kquMnYnhErYb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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