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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2ad6bf797d93bd39010e28787d767afb72a691a8f057607b76f938b2ed1c39' 
  AND token = '6bnbSbxBIiSeVyo36G29SQPpqtF9aGm+xtpyqFKpEcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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