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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f77f06cd63da96845a4b19e39f4ae9f6481f9d906c512d7e706e0ab18e8c98' 
  AND token = 'u5PMPtaqZppxJryRqnO6fj+JrOebcuHUEiUbQdHo+5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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