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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9b2f0ee6757721ae1829f40a58b4ff63979d3815c3601e0331150fa83b45ec' 
  AND token = '7OMu3Kjqprt1f3HkpFxNaw8xvySc1ggSRSDALrTbghc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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