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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586cc8870aae70757739665a89de92aedb5e2ea77ffdd96a02ef77a9b07efabe' 
  AND token = 'w4u5yAYGS85H9rGoBuPdo8lrR/j+g43QMoti0mdynlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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