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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1802575a34b81c9514055a83d9393b7ea1983785f208f29fb2d08c2bdd2cbe2c' 
  AND token = 'Vj9ZH9VFco5xtzz8zCJND9r/5DZKusZwSdxTy7Biw5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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