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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '516611e500f8481007fa513c2f561f308b14805ceccf96c58da094a26fe2f3f2' 
  AND token = 'mw9CW54uI3lyakcKNFAyk4T8vEQNmVfyylxr0SoiyuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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