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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3298ea6fe32cbc41333a6c68869bc025a0357631c23f0589ffe94ab733a7f5' 
  AND token = 'LAzcNnVfsU/E8DICx8xwe9njJ6XaKpP1/Lg9hhl5qKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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