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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66134eee5f852e8355c122e99bdb00f3b626333c9c40f4d0e6f1386bc9d27d9c' 
  AND token = '00vQla5PKODNfpXk1XQmhCoFqDuqN9M0up/CpGZTBjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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