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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a669184a83eaccc54f51f9267b468741cd691bf8ccccb7527453bf6ed6baf88' 
  AND token = 'qMN2HSuj6+MRIkmYvwSsKWW+ALAlkllC30ap8mvM3pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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