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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8f4a8dc5f3736ab1a0c8c0a212ac96986a87e1c327e992cd7ce1478147681b' 
  AND token = '6hWfPvayW6KAPppArSvDe+2mqOyO7aG0Wg9tA0lZm1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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