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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667d9c6754f28091434f598542ca3bab947084eb35de47522ada2a7e65274ed6' 
  AND token = 'KXdy/t89m5QwaPkSGe+7zQUfE7o6BXQst7qQVcHE5KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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