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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d76af1c320330b555201ec95758b84474198788eaefd80d1c765a593221980' 
  AND token = 'ajw2McwKExsZK3q/O2QKMUwL7cLrmK2f6vrNto9LWbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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