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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df014ad7d742d433de3c8bafdc10a5fe2fb46618cff3549ba6065f0e7cacbd18' 
  AND token = 'jbzncJE+dceaJfTKnfo08MGRFtD/+wQmi5Gn0yUlHIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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