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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e1e773f4281811d9803995dded94651486670584e9f4506a9498f9ea4cca29' 
  AND token = 'PkDButR06ia/kgKDZ06GepLJDjF5zb0hFd8jeKEdl3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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