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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd6621ff8b9742a3243eb9e5daf7a8bd5a860599210d3bc42a04f76ba27d3c9' 
  AND token = 'hdwgYOcXoEf+IMxeuS2neFgbo5Zw72xo28yDdUR5BEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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