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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e70bb89e8ad15f4333058e5db729e901b8c82deb78e27854223b132378b814e' 
  AND token = 'lbCc21OB+iIQVG6sywd4cuQp/NmOy5kCuHsEGqLnE2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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