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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd6df2866805e76960e0d21aad4c05cdb551ae5e5b6d0a79934877e26b3d76d' 
  AND token = 'eejFM5cwFn+B2Cp2F1PKivEZ5vyNmtVWyebn0NzE//k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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