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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d18a43dbdc8224bb53c655b3d760ae091557a30fd6bc3a5fb977a6facac5f7' 
  AND token = 'x/B3t5prYnf1AScb9So1s6dJ0fzClP7eFrXOw3ewSxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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