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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31af78336a2731a73a066113b6ff6acebfa7037e2eed36728c2aeca911a69e10' 
  AND token = '/xghBVwvO0lyDistmc1AmW/4szRdJfao+9jCRj0Z28w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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