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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4a632fb8fff0063e6a34b266c5f81c8e0c3123373a8e0b94d25fbaefed86ad' 
  AND token = 'V+ZhW6cPQLQACg+KRY9NbPRV/V0E34eidCN+vgylf7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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