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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6287cd722a8852bbf5bd1e8459cfa9126af5e45dafb5c7e13b478033fa66ac78' 
  AND token = 'nNESs61jZIOrz1JfrE2O7CBnjrZjT/LeUkdFzZGCa6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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