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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cee5db57f1683f9ff28fb32f899e7332001e0ad0c207333db57d2277413ae24' 
  AND token = 'uPNxeEYkTrHDt4cpXX+D76cV8qOu2xjGfVKqyguEIrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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