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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403977fd0ffcbbdb88f4d309bff82d29c91d6d00bf688cfec594d9022149c0fe' 
  AND token = 'J8yEmf4SNACOBDQ7c4hR5Ou1wIK3MlF4PvKwggapGjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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