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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d705a4bcd0b19d9a663ea24f4450d4198fd30ad9d3ab65210059a9ff19e6870' 
  AND token = 'keF2iNqEOVrOtBX6wySNByYISEfg2SzBJ3UN0Ii9J5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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