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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee1bb782cfed09cc29bed15a22b83727d3df70b0be673baf4aa05e587d9e673' 
  AND token = 'jxbNGRTdPtwrI8V3c+XgvScJw2EqWjgPtbZB5rX3f88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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