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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa651ca4ebe4296291217617d6f09d961aa138e9ff9e27176da8f8b2bddedb2' 
  AND token = 'iTSS4feenreDJ0cUHmHg0KDHOCnrbZD6dB+1YA69TeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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