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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a40a981ef609c92dd8b6fcab8a3c08c11d4201e85acaf7c597aa5418cd4f71d' 
  AND token = 'P0/RY/mPKKPFNhws1rDhxly0wF13km+HXGKMYrle2xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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