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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bed81c298a3b684332949c0315c080e202c36b1fc88f42c91b30e4563deb54' 
  AND token = 'LHAnabccau6qD+g+kZQMlo+AoEdWG7LGKs2Lc4Xct2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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