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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a158ed37bf128d09cafcf5d1b79e201a2ee887c660f6626a9b184c2014242c05' 
  AND token = '9ITvuy/ZB6nXv/FUWRtdDbjkBQABsbyNa/gafdw7V4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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