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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6d2e48146a94285d8c7bef5f3778e3b129bff6d7b6b5afba0f7b7d949bbae7' 
  AND token = 'NieZmygSNb3tZEm9/UHy9+g0ygozYozFUuIhNSKpz44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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