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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b756c4e7f042edabe5a87dd1a6fd18571f8052e4a54cd22ef89f1a5092ddf8' 
  AND token = 'uG2wFtPsEVcYxEyG1xlzts79qRjfwuuY2RSv4AXfuPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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