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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba7d6b2fb8fa564f17f938048b8274d0351a870b60ea59c90547480c49d9396' 
  AND token = 'OnPBAwpRcsU0CrsAN5OTCxrhSIHIa43wv8FWy4d8rMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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