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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5990091074e512ac798d80fec18a2c50032b0a9028aa0c4403e30291eb8afa3' 
  AND token = '4g/GfvRYhsdOKH6Q+d/1Xr+vlHtgYBxAbhvTwOpk6KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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