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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee804267eafb356cf3b560de3407e6349c0eac806c508e8716ed69cd99b7d495' 
  AND token = 'H3zIF/HGGmJSFLhlZdlC8YdctcWS7MypIY5JEWgodGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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