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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec39516655c9f87623ceef8a828f3e10efd9a9bc1150078ceb7ee1463d6a7ae' 
  AND token = 'rJGunqTawdw/u1WFDSOPDMa4Ww1Ru68KIKcG0lZaq6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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