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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630d4dd4329a8d4e2526208672873660993089cdc05faf2e81b8a60fae04cdc8' 
  AND token = 'dL8b7fb4Mi4nN4Q0a4viW239SVKJ9evJ26vyY0zaJpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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