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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f3cc0f66b03df52c3a1bbb87cbf08f6aa52141c9c10eb1155ba8d2bf09ae8d' 
  AND token = 'uVY/ckrmxjAnThzM913+iy5/oU3l0zuhLW9T56tiF2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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