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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbb610a844bfb9282df015531f7d536a59b80d2e679552dc0bf8ee5f0a1e47f0' 
  AND token = 'Yr5fj28F9JaHWz70GsfoHQhEvVzmMZE7QlV/uOifcF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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