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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fac7fd554ee1b40de5b59b200510471c13b574c82870dde9c1acea445c74435' 
  AND token = '0rNWxs41EOJqdMrEYCnTuV60WdFrC62FgO7KDFfwsZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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