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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6fa8961c404863a0856a65aeff3c64a2d9aadce6564d1346bb4faa046fffc6' 
  AND token = 'sQFWsb5epbesLM3REJYlFjwXU32qRVt33ttQ0Att6YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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