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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495e92d7f8e9bfcdf40beaa7d3626fc10e289bf0aa392e476c9fef5cea4ba084' 
  AND token = 'qjJnaaz5H/IL/cDpYyO4GtU8aCIKmOkQ9Dzwn+bW86g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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