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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ef444ca88d6f7c667d0cd01d3d6b67c6dba1fab7468c0178d9a2041baacf8d' 
  AND token = 'TljY3PS0j9dAOR2kzE1I1aHmvEyfrAQMw1kLJI1x+0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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