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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cb05953f88bd4aa6b7e39620e4a96216571e26118e7f2d0bdb58799c03ff6c' 
  AND token = 'sn0BdO/rYZc7eNbrQK8xay2QXNppOGuDxw4xocN0wOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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