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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84b822c855e87ca2af8fed4b5437e1975864deb8e05841b0091bf7666cba42b' 
  AND token = '9MQAavdrgo2XH7Qct/M2pCE34XQoRXqC60NmjCpPGO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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