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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3904900ef76da13d3a177e590f124cf3917a3f62d0d64e96ff7a780473275349' 
  AND token = 'Xjiv+peb4463K7BnAXLfS4tG9AQzoOF+MHu1rgzfoaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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